Add tests for valid factory to all model tests

spec/models/group_score_spec.rb

@@ -6,6 +6,9 @@ RSpec.describe GroupScore, type: :model do
   describe 'association' do
     it { should belong_to :team }
     it { should belong_to :group }
+  end
 
+  it 'has a valid factory' do
+    expect(build(:group_score)).to be_valid
   end
 end

spec/models/team_spec.rb

@@ -11,6 +11,9 @@ RSpec.describe Team, type: :model do
     it { should belong_to :tournament }
     it { should have_many :group_score }
     it { should have_many :scores }
+  end
 
+  it 'has a valid factory' do
+    expect(build(:team)).to be_valid
   end
 end

spec/models/tournament_spec.rb

@@ -29,4 +29,8 @@ RSpec.describe Tournament, type: :model do
     it { should have_many :teams }
     it { should have_many :stages }
   end
+
+  it 'has valid factory' do
+    expect(build(:tournament)).to be_valid
+  end
 end